JPH0530698A - Liquid-sealed equipment - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide a liquid-sealed device capable of easily increasing the absorption capacity of thermal expansion without increasing the projected area of the expansion and absorption device in a predetermined direction (longitudinal direction). [Structure] Expansion and absorption that is communicated with the sealed portion 3 through the water holes 4, 6, and 7 and absorbs the expansion / contraction of the sealed liquid 3a by changing the volume according to the expansion / contraction of the sealed liquid 3a. A plurality of expansion and absorption devices 5 having chambers 5g are provided in multiple stages.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid-sealed device, for example, an underwater electric motor, in which a sealed liquid is sealed.

[0002]

2. Description of the Related Art FIG. 5 is a sectional view showing an underwater electric motor which is a conventional liquid-sealed device. In the drawing, 1 is an underwater electric motor main body, 2 is a thrust bearing of a rotor of the underwater electric motor, and 3 is a thrust bearing 2. , A water hole 5 is connected to the water inlet 4 through the water hole 4, and expands / contracts in accordance with the expansion / contraction of the water liquid 3a. As a result, the expansion and absorption device absorbs the expansion and contraction of the enclosed liquid 3a, and is configured as follows.
Reference numeral 5a is a diaphragm which is an elastically deformable portion whose shape is changed by expansion and contraction of the enclosed liquid 3a, and 5b is a diaphragm 5.
It is a conical spring that reinforces the elastic strength of a, and expands and contracts as the diaphragm 5a deforms. 5c is an end cover for supporting the diaphragm 5a and the conical spring 5b, 5d is a retaining pin for the end cover 5c, 5e is a water hole for communicating the inside of the diaphragm 5a with the outside of the motor, and 5f is the diaphragm
The expansion absorption chamber 5g is formed between the diaphragm 5a and the storage box 5f, which is the storage box that stores the a, the conical spring 5b, and the like.

Next, the operation will be described. When the underwater electric motor is immersed in high temperature water or when the operation of the underwater electric motor is started, the temperature of the filled liquid 3a filled in the filled portion 3 rises, and the filled liquid thermally expands.

Therefore, thermal expansion of the enclosed liquid 3a causes a problem that the pressure inside the electric motor main body 1 rises abnormally. Therefore, the expansion and absorption device 5 adjusts the balance with the external pressure. That is, the thermally expanded filled liquid 3a flows into the expansion absorption chamber 5g through the water hole 4, and the pressure of the thermally expanded filled liquid 3a is larger than the pressing force of the conical spring 5b, so that the diaphragm 5a is compressed. . As a result, the thermal expansion of the enclosed liquid 3a is absorbed and the pressure drops, and the difference between the pressure inside and outside the electric motor is automatically adjusted so as not to exceed a predetermined value.

[0005]

Since the conventional liquid-sealed equipment is constructed as described above, especially when it is operated in high temperature water, water at room temperature (around 25 ° C.) is used. Since the thermal expansion of the enclosed liquid enclosed in the device is larger than that in the case of operating inside, it is necessary to increase the absorption capacity of the expansion absorber. As a means for increasing the absorption capacity, there is a method of increasing the diameter of the diaphragm or increasing the length of expansion and contraction of the diaphragm. However, when installing in a narrow place such as when installing in a well pipe, for example, there is a limit to increasing the projected area in a predetermined direction, that is, the diameter, and the length that can expand and contract without increasing the diameter is set. When the size is increased, there are problems that the deflection of the diaphragm becomes irregular and causes a buckling phenomenon, or the diaphragm is caught in the conical spring and damaged.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a liquid-sealed device capable of easily increasing the absorption capacity of thermal expansion without increasing the projected area in a predetermined direction. To aim.

[0007]

A liquid-sealed device according to a first aspect of the invention is communicated with a sealed portion in which a sealed liquid is sealed, and the volume of the sealed liquid changes according to expansion / contraction of the sealed liquid. A plurality of expansion / absorption devices having expansion / absorption chambers for absorbing expansion / contraction of the sealing water are provided in a predetermined direction in multiple stages.

In the liquid-sealed device according to the second aspect of the invention, the liquid sealing device is made to communicate with the enclosing part and expands and contracts according to the expansion and contraction of the enclosing liquid to absorb the expansion and contraction of the enclosing liquid. The expansion / absorption chamber having a deformable portion is housed in a housing portion by stacking a plurality of elastically deformable portions in a predetermined direction.

[0009]

In the liquid-sealed device according to the first aspect of the present invention, the plurality of expansion / absorption devices are provided in the predetermined direction in multiple stages to provide the thermal expansion absorption capacity without increasing the projected area in the predetermined direction. It increases according to the number.

Further, in the liquid-sealed device according to the second aspect of the present invention, the plurality of elastically deformable portions are provided in the storage portion in multiple stages, so that a plurality of elastically deformable portions can be stored in the equipment without complicating the structure. An expansion absorption chamber is formed.

[0011]

EXAMPLES Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing an underwater electric motor according to an embodiment of the present invention. In the drawing, the same reference numerals as those of the conventional one indicate the same or corresponding portions, and the explanation thereof will be omitted.

6 and 7 are water holes, 8 is a sealing plug of the water hole 7, and 5 is communicated with the enclosing portion 3 through the water hole 4, and by expanding and contracting in response to the expansion and contraction of the enclosing liquid 3a, These are two expansion / absorption devices that absorb the expansion / contraction of the sealing water, and are provided in the F portion of the motor body 1 in multiple stages. 9 is a water hole, 10 is attached to the lower end of the storage box 5f with a bolt 11,
A second storage box for storing the diaphragm 5a and the like, 1
Reference numeral 2 is a seal member that seals the mating surfaces of the case 5f and the storage box 12.

Next, the operation will be described. The thermally expanded filled liquid 3a flows into the two expansion absorption devices 5 through the water holes 4 or the water holes 6 and 7.

As described above, by providing the two expansion / absorption devices 5, it is possible to secure double the absorption capacity as compared with the conventional one. Therefore, the standard diaphragm 5a can be used without increasing the diameter of the diaphragm or the length of expansion and contraction thereof, and the operation can be performed even in high temperature water which could not be operated until now. .

Example 2. Further, in the above-mentioned embodiment, the case where the two expansion absorbing devices 5 are provided has been described, but as shown in FIG. 2, if the expansion absorbing device 5 is further added, a larger absorption capacity can be obtained. Therefore, it suffices to select the number of expansion absorbers according to the usage conditions such as the liquid temperature.

Embodiment 3. FIG. 3 is a sectional view showing an underwater electric motor according to another embodiment of the present invention.
The same reference numerals as those in FIG. 2 indicate the same or corresponding portions, and thus the description thereof will be omitted.

Reference numeral 13 is a water hole, 14 is a stainless steel cover which does not expand and contract, 15 is a water hole provided in the cover 14, 16 is a cylindrical housing portion for housing two expansion absorbing devices 5, and 17 is It is a water hole. In this example,
The expansion absorption chamber 5g is formed by the cover 14 and the diaphragm 5a.

Next, the operation will be described. The filled liquid that has been thermally expanded in the filled portion 3 passes through the water holes 6, 7, 13, 15.
It flows into the individual expansion / absorption devices 5, and the thermal expansion of the sealing water is absorbed in the two expansion / absorption devices 5 as in the first embodiment.

Further, as shown in FIG. 3, the two expansion absorbing devices 5 are housed in the cylindrical housing portion 15 so as to face each other in opposite directions. In this way, the cylindrical storage unit 1
By accommodating two diaphragms 5a in 5, the storage box 5f can be attached to the electric motor main body 1 for each expansion / absorption device or the water hole 4 as in the first and second embodiments shown in FIGS.・ No need to install 7 ・ 9
This has the effect of simplifying the structure.

Example 4. Further, in the third embodiment described above, two diaphragms 5a are provided, but four diaphragms may be provided as shown in FIG. Therefore, it suffices to select the number of expansion absorbers according to the usage conditions such as the liquid temperature.

In the third and fourth embodiments, the adjacent diaphragms 5a are housed in the lids in the opposite direction, but they may be housed in the same direction. In each of the above-described embodiments, the case of the underwater motor has been described, but the same effect can be obtained even with a transformer having a filled liquid.

[0022]

As described above, according to the first aspect of the present invention, the plurality of expansion / absorption devices for absorbing the expansion of the enclosed liquid are provided in multiple stages in the predetermined direction, so that the projection area in the predetermined direction is increased. The absorption capacity for thermal expansion can be increased without doing so.

Further, according to the second aspect of the invention, since the accommodating portion for accommodating the plurality of elastically deformable portions in the predetermined direction is provided, the structure is simplified in addition to the effect of the invention according to the first aspect. Become.

[Brief description of drawings]

FIG. 1 is a sectional view showing an underwater electric motor according to an embodiment of the present invention.

FIG. 2 is a sectional view of an underwater electric motor showing another embodiment of the present invention.

FIG. 3 is a sectional view showing an underwater electric motor according to an embodiment of the present invention.

FIG. 4 is a sectional view of an underwater electric motor showing another embodiment of the present invention.

FIG. 5 is a sectional view showing a conventional underwater electric motor.

[Explanation of symbols]

3 Enclosure 3a Filled liquid 5 Expansion absorber 16 Cylindrical storage

Claims (2)

[Claims] 1. An encapsulating part in which an encapsulating liquid that expands due to heat is encapsulated, and the encapsulating part communicates with each other to expand the encapsulating liquid.
In a liquid-sealed device including an expansion / absorption device having an expansion / absorption chamber that absorbs expansion / contraction of the enclosed liquid by changing the volume according to contraction, a plurality of the expansion / absorption devices are arranged in multiple stages in a predetermined direction. A liquid-sealed device characterized by being provided. 2. An encapsulation part enclosing an encapsulation liquid which expands by heat, and an expansion part of the encapsulation liquid which is communicated with the encapsulation part.
In a liquid-sealed device including an expansion and absorption chamber having an elastic deformation part that absorbs expansion and contraction of the enclosed liquid by expanding and contracting according to contraction, a plurality of elastic deformation parts are stacked in a predetermined direction in multiple stages A liquid-sealed device, characterized in that a storage portion for storing the plurality of elastically deformable portions is provided.